Wheel and brake shoe



p 22, 1931- J. CONNOLL-Y 1,823,879

WHEEL AND BRAKE SHOE Original Filed Sept. 27, 1927 gwmntoc Patented Sept. 22, 1931 FAT JOHN L.- coNNoLLY, or new Yonx. my.

WHEEL AND nimxn srroii Original application filed September 27, 1927, Serial No. 222,367. Divided and this application filed April 16, 1928. Serial No. 270,380. r

This invention relates to improvements in wheels and brake-shoes.

The invention forming the subject-matter of this application is a division of my copending application Serial No. 222,367, filed September 27, 1927.

The principal object of the invention is to particular shape adapted to securely retain a friction-compound therein and to present the same at the contacting surfaces of these elements.

While the invention is particularly adapted to railway wheels and brake-shoes, it is not necessarily limited thereto but may be used in connection with other types of wheels.

It has heretofore been proposed to provide the braking surfaces of brake-shoes withinserts of friction-material, but in such cases the.

friction-material contacts directly with the metallic tread of the wheel and no great increase in the efficiency of the brake is attained by such constructions. By my invention, which includes the provision of a friction-insert in the wheel-tread so arranged as to contact with a similar insert in the brake-shoe when the brake is applied, the braking force is materially increased and, thus, the brakes rendered more eflicient.

In the accompanying drawings,'I have illustrated an embodiment of my invention; 40 but it is to be understood that I am not limited to the particular form of wheel or brakeshoe therein shown.

In these drawings: Fig. 1 is a side elevation of a railway wheel of well known construction, showing a brakeshoe in contact therewith;

Fig. 2 is a front elevation of a brake-shoe, illustrating the friction-insert; and

Fig. 3 is a sectional view, on line 33 of so Fig. 1, showing the brake-shoe-and wheel contact when thebrake is applied.

eachprovided with friction inserts which Referringnow to the drawings, the reference-numeral 1 indicates, generally, a railway wheel which may be of any well known, and standard construction.

7 The wheel is providedwith a tread 2 in which is formed a groove 3 adapted to receive an insert of friction-material 4. As willbe noted from the drawings, this groove extends about the en-.- tire periphery of the wheel. Theside-walls of the groove diverge from the-tread surface inwardly and at the base of the grooveis provided a pyramidal projection .5. This projectionforms .with the side-walls of the,

groove a pair of diverging channels into which the friction compound is inserted. By reason of this construction of the groove, the compound is securelyretained in the wheel and cannot work loose and drop out. H This groove is filled with a friction-com pound consisting ofv sand, cement, asphalt, and other ingredients properly mixed in the I oresence of heat which com ound is inserted into the groove while in plastic state. The particular compound used forms the subject-matter of my co-pending application SerialNo. 271,107, filed April 18, 1928, which is also a divisionof application Serial No.

' 222,367, filedSeptember 27, 1927. As the; Y tread of the wheel wears away, the surface of the friction-compound will also wear, thus presenting -at all times a strip of frictionfmaterial at the wearing surface of the wheel. j The-reference-numeral 6 indicates a brake-- shoe which maybe of any well known construction. The braking-face thereof is provided with a groove .7 which is similar to the groove 3 in the wheel and is provided with a pyramidal projection 8. Thisgroove is filled with friction-compoundQ similar to i that above described and is adapted to contact with the friction-compound in the wheel -when the brakeis applied.

By this arrangement, the use of tracks is dispensed with, and yet the power a of the brakes is increased, thus facilitating and insuring safer stops. As described in my H co -pending application Serial No. 222,367, the efficiency of the brake is also;

Nr OFFICE sand on I materially increased by reason of the contact of the friction-insert in the Wheel with that in the track.

It is believed that my invention and its many advantages have now been made clear. It will be obvious to those skilled in the art that the invention may be applied to any of the forms of wheels and brake-shoes now in use, and that it is not limited. to the particular forms herein illustrated; It will also be understood that while I have herein illustrated the wheel and brake-shoe as having a single groove for containing the-frictioncompound, a plurality of grooves may be pro.-

vided, if desired. When such is the case,

the grooves in the wheel and brake-shoe will be so arranged that the friction-ins'erts in the respective members will contact when the brake is applied.

VVh-at I claim is 1. In combination, a wheel having'in its tread an'insert'of friction-material, anda brake-shoe having an insert of friction-material in the braking-face thereof adapted to contact with the insert in the Wheel-tread when thebrake is applied.

2; In combination, a wheel provided with. a peripheral-groove, a friction-compound inserted in said groove, anda brake-shoe having a groove in the braking face thereof and provided with a friction-compound adapted to contact with that in the Wheel when the brake is applied.

3. The combination of a wheel having'in its tread a groove provided with a pyramidal projection, a friction compound in said groove, and a brake-shoe having in liZSbIBtLking-surface a groove of similar shape to that in the wheel-tread, the last-mentioned groove containing a friction-compound adapted to contact with the compound in the wheel-tread when the brake is applied.

t. A brake-shoe provided with a longitudinally extending groove, a pyramidal projection in said groove, and a friction-compound 1 inserted'in said groove.

7 5. A brake-shoe provided with a longitudinally extending groove having diverging side-walls, a pyramidal projectionin said groove, and a friction-compound inserted in said groove and lodged between the 'side-. walls thereof and the sides of said projection.

6. A brake-shoe provided with a longitudinally extending groove having diverging side-walls, a pyramidal projection in said groove, and a frict on compoundinserted in said groove and presenting at the brakingsurface of said shoe a continuous strip of friction-material.

In testimony whereof I aifi'x my signature.

JOHN L. CONNOLLY.' 

